I purchasedthis separately, but you may not need to use one. The way the reactor is built the water inlet is on the "suction" side...thus water is automatically drawn into the reactor.
However, I used the MJ400 to fill the reactor and flush the dust from the media.
Does that help?
Paul.
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Paul W Whitby Ph.D
President Central Okla. Marine Aq. Soc.
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